Etymology

athwart

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Today it means: From side to side, often in an oblique manner; across or over. Full definition →

Middle English athwert ← Old Norse þvert ← Proto-Germanic *þwerhaz
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The story

  1. Proto-Indo-European · derived from*terkʷ-“to spin; to turn”
  2. Proto-Germanic · derived from*þerh-
  3. Proto-Germanic · derived from*þweraną“to stir; to swirl; to turn”
  4. Proto-Germanic · derived from*þwerhaz“cross; adverse”
  5. Old Norse · derived fromþvert“across, athwart”
  6. Middle English · inherited fromathwert
  7. English todayathwart

From Late Middle English athwert, athirt, from a- (prefix meaning ‘in the direction of, toward’) + thwert (“crosswise; (cooking) across the grain”, adverb). Thwert is derived from thwert (“crosswise, transverse; counter, opposing; contrary, obstinate, stubborn”, adjective), borrowed from Old Norse þvert (“across, athwart”), originally the neuter form of þverr (“across, transverse”), from Proto-Germanic *þwerhaz (“cross; adverse”) (altered or influenced by Proto-Germanic *þweraną (“to stir; to swirl; to turn”)), from Proto-Germanic *þerh-, probably from Proto-Indo-European *terkʷ- (“to spin; to turn”). The English word is analysable as a- (prefix meaning ‘in the direction of, toward’) + thwart (“placed or situated across something else”). Cognates * Scots athort (“athwart”)

Words from the same roots

Old Norseþvert all →

Proto-Germanic*þweraną all →

twire

Proto-Indo-European*terkʷ- all →

torchtort

Etymology from Wiktionary, CC BY-SA 4.0.